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A body of mass $2\,kg$ slides down with an acceleration of $3\,m/s^2$ on a rough inclined plane having a slope of $30^o$ . The external force required to take the same body up the plane with the same acceleration will be  ........ $N$ $(g\, = 10\, m/s^2)$
  • A$4$
  • B$14$
  • C$6$
  • D$20$
JEE MAIN 2018, Diffcult
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